On the day of the Tennomifune Academy entrance ceremony, in the class 1-7 classroom, Hanakoizumi Anne (Hanako), Hibarigaoka Ruri (Hibar), and Kumegawa Botan (Botan) are told by their homeroom teacher Kodaira-sensei that they are unfortunate and unhappy students.
The goal of the students of class 1-7, who are burdened by a variety of forms of misfortune, is to become happy.
The three girls have trouble accepting their circumstances, but they're immediately given an unexpected assignment...!
I suppose you could say the smaller 
your number, the luckier you are.
يمكنُكن القول أنّه كلّما نَقُصَ الرّقم
كلّما زادت حظوظكن
Man könnte sagen: Je kleiner die Nummer,
desto mehr Glück habt ihr.
Podría decirse que los números
menores representan una suerte mayor.
Podría decirse que los números
menores representan una suerte mayor.
Vediamo un po'... Facciamo che più basso sarà
 il vostro numero, più siete fortunate.